Shika Hoshasen

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Purpose: Computed radiography (CR) has widely used a dynamic range and unique processing capabilities. Recently, CR has been used to obtain cephalogram. There are many reports that examining cephalogram using CR about cephalometric landmarks of hard tissue. An analysis and a diagnosis of soft tissue with cephalogram are important for orthodontic treatment. However, there has been little attention to the assessment of soft tissue on cephalogram. This study was to evaluate soft tissue-weighted images on cephalogram using CR with the multi-objective frequency processing technique.
Materials and methods: Cephalogram CR images were obtained with 6 kinds of processing conditions in the multi-dynamic range control processing of multi-objective frequency processing technique. Each image was compared with standard images processed like analog radiograms for the evaluation of 5 anatomical structures on CR cephalograms in 20 subjects. Image assessments were rated as 5 points (extremely easy to observe), 4 points (easy to observe), 3 points (equal to standard image), 2 points (difficult to observe), and 1 point (extremely difficult to observe). The statistical software used in this study was Stat-View J 5.0 (Abacus Concepts., CA, USA), Dunnet multiple-comparison testing was carried out.
Result: Type-A was more equal compared with a standard image, and the description of the soft tissue of type-D was inferior. Type-H and L obtained the result in which only the profile is excellent. Type-E and I were very excellent evaluations. Especially, type-I demonstrated a significant difference compared to all the 5 anatomical structures.
Conclusion: It is suggested that the most suitable soft tissue-weighted images on cephalogram using CR with multi-objective frequency processing technique is type-I (MDT).

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